# -*- coding: utf-8 -*-

"""
@author: kai
@software: PyCharm
@file: part4.py
@time: 2021/5/4:下午10:38
"""

import turtle
import random

p = turtle.Turtle()
a = [5, 7, 9, 11]
b = random.choice(a)
print(b)
for i in range(b):
    p.forward(200)
    p.left(180 - 180/b)
turtle.done()